For example, if i cast chill fog and combusting wounds on enemies on top of it - will chill fog cancel combusting wounds debuff?

What about shining beacon (priest AOE fire spell) ?

Any guide on spell's counters mechanics?

2 hours ago, Noes631 said:

For example, if i cast chill fog and combusting wounds on enemies on top of it - will chill fog cancel combusting wounds debuff?

What about shining beacon (priest AOE fire spell) ?

Any guide on spell's counters mechanics?

It depends on the spell. Not everything is counterable iirc. But it should say on the spell tooltip. For example Shining Beacon has Counters: Water, Frost listed on the spell. That means that Moonwell for example (key words: Rejuvenation/Water) will counter and cancel the effects of a Shining Beacon.

I don't know if there is a guide anywhere that goes into detail on how it all works but you basically have to pay attention to the key words on spells. If something says it's countered by Water, Frost then you need to find spells with those keywords to counter it.

2 hours ago, Noes631 said:

For example, if i cast chill fog and combusting wounds on enemies on top of it - will chill fog cancel combusting wounds debuff?

What about shining beacon (priest AOE fire spell) ?

Any guide on spell's counters mechanics?

If both spells come from you it won't counter.

Chill fog will even proc CW.

Only hostile spells can be countered afaik.